Frequency Converter

What Is the Frequency Converter?

The Frequency Converter converts a frequency value between the units used in electronics, radio, audio, and rotating machinery: hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz), revolutions per minute (RPM), and radians per second (rad/s). Frequency is the number of cycles per second, and the SI unit is the hertz: 1 Hz = 1 cycle per second.

How to Use the Frequency Converter

1. Enter the frequency value in hertz (Hz) in the Value box. If your value is in another unit, convert it to hertz first: 1 kHz = 1,000 Hz, 1 MHz = 1,000,000 Hz, and 1 GHz = 1,000,000,000 Hz.
2. Use the From and To dropdowns to note the units you are working with, and use Swap to reverse them.
3. Click Process.
4. Read the result, which lists the equivalent frequency in kHz, MHz, and rad/s.
5. Use Copy or Download to save the result.

Worked Example

Enter 2 and click Process. The result reads: 2 Hz = 0.002000 kHz, 2 Hz = 0.000002000 MHz, and 2 Hz = 12.566371 rad/s. To convert a kilohertz value, first multiply by 1,000: 2 kHz = 2,000 Hz, which is 0.002 MHz. The rad/s figure is the angular frequency, calculated as 2 x pi x f = 2 x 3.141593 x 2 = 12.566371.

Limitations

• The result list is calculated from the base unit, the hertz. Enter the value in Hz, or convert it to Hz first using the factors above.
• The From and To dropdowns do not change the calculation. The result is computed from the number you entered, treated as hertz.
• The rad/s figure is angular frequency (omega = 2 x pi x f), not cycles per second. Do not confuse 12.57 rad/s with 12.57 Hz.
• RPM is revolutions per minute: 1 Hz = 60 RPM, so a 2 Hz rotation is 120 RPM. The tool lists frequency units; it does not model motors, gears, or loads.
• Results are rounded, so very small or very large frequencies may display with limited precision. Keep extra digits for lab work.

Frequently Asked Questions

How do I convert GHz to MHz?

Multiply by 1,000. For example, 2.4 GHz = 2,400 MHz.

What is the difference between Hz and rad/s?

Hz counts cycles per second. Radians per second is angular frequency: omega = 2 x pi x f, so 1 Hz = 6.283185 rad/s.

How many hertz are in 1 RPM?

1 RPM = 1/60 Hz, about 0.016667 Hz, because one revolution per minute is one cycle every 60 seconds.

What period corresponds to 2 Hz?

The period is T = 1/f, so 2 Hz means one cycle every 0.5 seconds.